133803281 has 2 divisors, whose sum is σ = 133803282. Its totient is φ = 133803280.

The previous prime is 133803253. The next prime is 133803287. The reversal of 133803281 is 182308331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130325056 + 3478225 = 11416^2 + 1865^2 .

It is a cyclic number.

It is not a de Polignac number, because 133803281 - 2¹⁴ = 133786897 is a prime.

It is a super-2 number, since 2×133803281² = 35806636012729922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (133803287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66901640 + 66901641.

It is an arithmetic number, because the mean of its divisors is an integer number (66901641).

Almost surely, 2^133803281 is an apocalyptic number.

It is an amenable number.

133803281 is a deficient number, since it is larger than the sum of its proper divisors (1).

133803281 is an equidigital number, since it uses as much as digits as its factorization.

133803281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 133803281 is about 11567.3368153607. The cubic root of 133803281 is about 511.4724600225.

It can be divided in two parts, 13380 and 3281, that added together give a palindrome (16661).

The spelling of 133803281 in words is "one hundred thirty-three million, eight hundred three thousand, two hundred eighty-one".